Solved garlin's PowerShell scripts for updating Secure Boot CA 2023

rtorres · May 2, 2026

garlin said:
I don't have this problem. You're on 26H1 (28000). Does your system have another language installed? This looks like Cyrillic -> Диск#0, раздел…

Yes, I have the Russian version of Windows 11 26H1

garlin · May 2, 2026

Could have mentioned that the first time. I'm guessing string matching isn't portable.

rtorres · May 2, 2026

garlin said:
Could have mentioned that the first time. I'm guessing string matching isn't portable.

My bad, I should’ve mentioned that earlier. That probably explains the Cyrillic strings and why any string matching would get weird.

That also explains why this worked for me:

Code:

mountvol Z: /S
mountvol Z: /L
dir Z:\EFI\Microsoft\Boot
mountvol Z: /D

Using mountvol /S let me access the ESP directly without depending on the localized Disk/Partition text output.

garlin · May 2, 2026

Is this $true or $false?

Code:

[regex]::Match((Get-CimInstance -ClassName Win32_BootConfiguration).Caption,'\d+').Groups[0].Value -eq [char]48

rtorres · May 2, 2026

garlin said:
Is this $true or $false?

Code:

[regex]::Match((Get-CimInstance -ClassName Win32_BootConfiguration).Caption,'\d+').Groups[0].Value -eq [char]48

This comes up as True:

Powershell:

PS C:\Windows\System32> [regex]::Match((Get-CimInstance -ClassName Win32_BootConfiguration).Caption,'\d+').Groups[0].Value -eq [char]48
True
PS C:\Windows\System32>

garlin · May 2, 2026

Different method:

Code:

$GUID = (Get-Partition -Number ((Get-CimInstance -ClassName Win32_BootConfiguration).Caption -replace '\\Device\\Harddisk' -replace '\\Partition',',')).Guid
Get-Childitem -LiteralPath ('\\?\Volume{0}\' -f $GUID)

Fred123 · May 3, 2026

garlin said:
Let's try restoring the correct ACL's on the SecureBootUpdates folder.

1. Download PowerRun.

2. Save this attachment file ("RESTORE_ACL.txt") to your PC.

3. Open an elevated CMD shell window.

4. Run this command from the CMD:

Code:

icacls C:\Windows\System32 /restore RESTORE_ACL.txt

5. Close the CMD.

I found the problem causing my dbxupdate.bin not found when running your Check_UEFI-CA2023.ps1 script (VERSION 2026.04.24).

I was running PowerShell (x86) [32 bit] on Windows 11 as Administrator, and ran the CHECK script from this window. This always gave me an error trying to access dbxupdate.bin.

When I use the default PowerShell [64 bit], your Check_UEFI-CA2023.ps1 script runs to completion (output below).

I also checked that I could "cd" into C:\Windows\System32\SecureBootUpdates\ from a 64-bit PS session, but not from 32-bit PS.

So I didn't need to change the ACLs of SecureBootUpdates to fix my problem.

I'm not sure if I still have a problem with my Windows 11, but given that your script runs successfully, it's possible all is OK.

Garlin, thanks for your time and help, and maybe spell out the obvious for people like me to use the default [64-bit] PowerShell on Windows 11.

Here is the output from Check_UEFI-CA2023.ps1 (VERSION 2026.04.24). Please let me know if all is OK with the details. Do I need to revoke manually?

Thanks

garlin · May 3, 2026

Thanks for identifying the problem!

1. 32-bit processes can't read all of the folders and files under "C:\Windows\System32", because it' a mapped (or virtual) folder. Instead they're supposed to use "C:\Windows\SysNative" in place of System32.

I've tweaked all the scripts to recognize which folders are needed for 32 or 64-bit execution.

2. Your UEFI has the CA 2023 certs added, but CA 2011 hasn't been revoked (still optional for now).

rtorres · May 3, 2026

garlin said:

Different method:

Code:

$GUID = (Get-Partition -Number ((Get-CimInstance -ClassName Win32_BootConfiguration).Caption -replace '\\Device\\Harddisk' -replace '\\Partition',',')).Guid
Get-Childitem -LiteralPath ('\\?\Volume{0}\' -f $GUID)

Powershell:

PowerShell 7.6.1
PS C:\Users\RYSZARD> $GUID = (Get-Partition -Number ((Get-CimInstance -ClassName Win32_BootConfiguration).Caption -replace '\\Device\\Harddisk' -replace '\\Partition',',')).Guid
Get-Partition: No MSFT_Partition objects found with property 'PartitionNumber' equal to '1'.  Verify the value of the property and retry.
PS C:\Users\RYSZARD> Get-Childitem -LiteralPath ('\\?\Volume{0}\' -f $GUID)
Get-ChildItem: Cannot find path '\\?\Volume\' because it does not exist.
PS C:\Users\RYSZARD>

garlin · May 3, 2026

There's something weird about your PS...

Get-Partition is complaining that PartitionNumber has the string value "1", and not integer 1. A normal PS session would convert that value, without you needing to perform any magic. I can duplicate the warning by explicitly casting the value 1 to a string, as the Number parameter.

The script works for almost everyone, so it's gotta be local to your PC. I'd rather not be calling mountvol to get around this problem, because it points to a more serious failure which isn't being handled.

rtorres · May 3, 2026

garlin said:
There's something weird about your PS...

Get-Partition is complaining that PartitionNumber has the string value "1", and not integer 1. A normal PS session would convert that value, without you needing to perform any magic. I can duplicate the warning by explicitly casting the value 1 to a string, as the Number parameter.

The script works for almost everyone, so it's gotta be local to your PC. I'd rather not be calling mountvol to get around this problem, because it points to a more serious failure which isn't being handled.

No problem, friend. I figured I’d mention it in case anyone else runs into the same issue, but if it looks specific to my local setup, I’ll just stick with the workaround on my end.

Appreciate you taking a look!

GunnzAkimbo · May 3, 2026

I tried that script you posted just a few back and received this:
*update: is it because i am launching from D: drive ? I have all my utilities on that.

UEFI DBX Certs
--------------
(NONE)
Windows BootMgr SVN
Get-Partition: D:\AdminTools\CheckCA2023\Check_UEFI-CA2023.ps1:1591
Line |
1591 | $GUID = (Get-Partition -Number $Number).Guid
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| No MSFT_Partition objects found with property 'PartitionNumber' equal to '221'. Verify the value of the property and retry.
Get-HarddiskVolume: D:\AdminTools\CheckCA2023\Check_UEFI-CA2023.ps1:1593
Line |
1593 | $EFI_Path = '{0}\EFI' -f (Get-HarddiskVolume $GUID)
| ~~~~~
| Cannot bind argument to parameter 'VolumeGUID' because it is an empty string.
Command cannot find any of the specified files.

garlin · May 3, 2026

What's the response from this command?

Code:

powershell -C (Get-CimInstance -ClassName Win32_BootConfiguration).Caption

GunnzAkimbo · May 3, 2026

garlin said:
What's the response from this command?

Code:

powershell -C (Get-CimInstance -ClassName Win32_BootConfiguration).Caption

\Device\Harddisk22\Partition1 : The term '\Device\Harddisk22\Partition1' is not recognized as the name of a cmdlet, function, script file, or operable
program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again.
At line:1 char:1
+ \Device\Harddisk22\Partition1
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : ObjectNotFound: (\Device\Harddisk22\Partition1:String) [], CommandNotFoundException
+ FullyQualifiedErrorId : CommandNotFoundException

My drive list is kinda odd. the NVME is the last drive on the system. I have lots of drives and raids.

DISKPART> list disk

Disk ### Status Size Free Dyn Gpt
-------- ------------- ------- ------- --- ---
Disk 0 Online 9 TB 0 B *
Disk 1 Online 1863 GB 0 B * *
Disk 2 Online 1863 GB 0 B * *
Disk 3 Online 1863 GB 0 B * *
Disk 4 Online 1863 GB 0 B * *
Disk 5 Online 1863 GB 0 B * *
Disk 6 Online 1863 GB 1024 KB * *
Disk 7 Online 1863 GB 1024 KB * *
Disk 8 Online 1863 GB 1024 KB * *
Disk 9 Online 1863 GB 1024 KB * *
Disk 10 Online 1863 GB 1024 KB * *
Disk 11 Online 3726 GB 0 B *
Disk 12 Online 931 GB 1024 KB * *
Disk 13 Online 931 GB 1024 KB * *
Disk 14 Online 931 GB 1024 KB * *
Disk 15 Online 931 GB 1024 KB * *
Disk 16 Online 1863 GB 0 B *
Disk 17 Online 1863 GB 0 B *
Disk 18 Online 167 GB 0 B *
Disk 19 Online 111 GB 0 B *
Disk 20 Online 931 GB 0 B *
Disk 21 Online 465 GB 1024 KB *
Disk 22 Online 465 GB 5120 KB *

GunnzAkimbo · May 3, 2026

v2026.04.24 operates as normal without any messages, i will just stick with that release.

suatcini54 · May 4, 2026

@garlin I just downloaded the recent updates from your first post. Now there is something wrong with the script Check_uefi-CA2023.ps1

I run the script with verbose and audit command and I get this (between equality-sign lines):
=================================================================
Windows 11 25H2 (26200.8328)

Secure Boot: ON
Virtualization Based Security: ON
BitLocker on (C:) OFF

BIOS Firmware
-------------
ASUS All Series
Version: 2503
Date: 2016-02-26

Factory Default UEFI PK Cert
----------------------------
(NONE)

UEFI PK Cert
------------
ASUSTeK MotherBoard PK Certificate

Factory Default UEFI KEK Certs
------------------------------
(NONE)

UEFI KEK Certs
--------------
Microsoft Corporation KEK CA 2011
Microsoft Corporation KEK 2K CA 2023
Canonical Ltd. Master Certificate Authority
ASUSTeK MotherBoard KEK Certificate

Factory Default UEFI DB Certs
-----------------------------
(NONE)

UEFI DB Certs
-------------
Microsoft Corporation UEFI CA 2011
Microsoft Windows Production PCA 2011
Microsoft Option ROM UEFI CA 2023
Microsoft UEFI CA 2023
Windows UEFI CA 2023
Canonical Ltd. Master Certificate Authority
ASUSTeK MotherBoard SW Key Certificate
ASUSTeK Notebook SW Key Certificate

Factory Default UEFI DBX Certs
------------------------------
(NONE)
EFI_CERT_SHA256_GUID Signatures: 0

UEFI DBX Certs
--------------
Microsoft Corporation UEFI CA 2011
Microsoft Windows Production PCA 2011
Windows BootMgr SVN 8.0
EFI_CERT_SHA256_GUID Signatures: 440

UEFI Variable
-------------
SBAT (Linux only): sbat,1,2024010900 / shim,4 / grub,3 / grub.debian,4
[31;1mGet-Volume_DevicePath: [0mI:\MiCROSOFT\CERT\SecureBoot-CA-2023-Updates\Check_UEFI-CA2023.ps1:1395[0m
[31;1m[0m[36;1mLine |[0m
[31;1m[0m[36;1m[36;1m1395 | [0m $EFI_Path = '{0}EFI' -f (Get-Volume_DevicePath [36;1m$GUID[0m)[0m
[31;1m[0m[36;1m[36;1m[0m[36;1m[0m[36;1m | [31;1m ~~~~~[0m
[31;1m[0m[36;1m[36;1m[0m[36;1m[0m[36;1m[31;1m[31;1m[36;1m | [31;1mCannot process argument transformation on parameter 'VolumeGUID'. Cannot convert value to type System.String.[0m
Command cannot find any of the specified files.
=====================================================================

The script stops at UEFI Variable section and never completes to the end.

What is wrong ? Is the script ~~wrong~~ not suitable for the BIOS firmware of my PC or is it my PC that is acting wrong in other ways ? I had never seen SBAT (Linux only) grub,3, etc. in the output before.

garlin · May 4, 2026

The script is done with UEFI Variable. It's stuck on checking out your EFI's Boot Manager file.

I don't know if you're using the most recent, work-in-progress script. The new script reports on UEFI variables, which is a new feature. SBAT is an UEFI security setting for Linux systems, but Windows writes it for everyone unless you opted out.

suatcini54 · May 4, 2026

I downloaded your script at the time I wrote my issue. So I think it should be the latest if you update your first post at page 1.

I never had this issue before. This issue is not important to me because I know my secure boot certificate update status is O.K. I sometimes re-check in order to see what improvements you make in your scripts. Your scripts seem too complicated to me, though. I just like to see the improved output.

Thanks for all the tedious work you undertake to do to help people make a smooth transition to secure computing.

garlin · May 4, 2026

I don't update post #1 until a new script is nearing official release, because the work-in-progress versions might have bugs, or add fixes for a recently reported problem.

The reason for adding UEFI variables is mostly to track "UEFI lock" where a Windows policy has added new UEFI variables to enforce SkuSiPolicy or LSA even if the Windows setting for enforcement has been disabled. Otherwise you might complain that a setting is "off", but Windows is ignoring the reg value and using the UEFI variable for the same setting.

I'm also pairing it with a new script to automate the clearing of UEFI locks. And another script to predict if SkuSiPolicy will block certain versions of winload.efi.

The first half of my script was dedicated to applying Secure Boot certs. Now the second half has to follow all the revocation (or enforcement) steps since those can block booting of WinRE-based USB drives.

Dirtyflash · May 4, 2026

@garlin I'm pretty sure MS is following this thread and often asking themselves: " Why didn't we think of that? ".

Solved garlin's PowerShell scripts for updating Secure Boot CA 2023

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